IDEA啟動vue程序，瀏覽器訪問時出現如下情況的關於node-sass的錯誤：
錯誤1：
Module build failed (from ./node_modules/sass-loader/dist/cjs.js)
Error:Cannot find module 'node-sass'
錯誤2：
Module build failed (from ./node_modules/sass-loader/dist/cjs.js)
Error:no such file or directory, open 'D:\SourceProject\sichebangong\car-pub-vue\node_modules\node-sass\lib\index.js'
Failed to compile.
./src/back/views/user/Login.vue?vue&type=style&index=0&id=1503f165&lang=scss&scoped=true& (./node_modules/css-loader??ref--8-oneOf-1-1!./node_modules/@vue/cli-service/node_modules/vue-loader/lib/loaders/stylePostLoader.js!./node_modules/postcss-loader/src??ref--8-oneOf-1-2!./node_modules/sass-loader/dist/cjs.js??ref--8-oneOf-1-3!./node_modules/cache-loader/dist/cjs.js??ref--0-0!./node_modules/vue-loader/lib??vue-loader-options!./src/back/views/user/Login.vue?vue&type=style&index=0&id=1503f165&lang=scss&scoped=true&)
Module build failed (from ./node_modules/sass-loader/dist/cjs.js):
Error: ENOENT: no such file or directory, open 'D:\SourceProject\sichebangong\car-pub-vue\node_modules\node-sass\lib\index.js'
at Object.openSync (fs.js:440:3)
at Object.readFileSync (fs.js:342:35)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:994:22)
at Module.load (internal/modules/cjs/loader.js:815:32)
at Function.Module._load (internal/modules/cjs/loader.js:727:14)
at Module.require (internal/modules/cjs/loader.js:852:19)
at require (internal/modules/cjs/helpers.js:74:18)
at getDefaultSassImpl (D:\SourceProject\sichebangong\car-pub-vue\node_modules\sass-loader\dist\index.js:198:10)
at Object.loader (D:\SourceProject\sichebangong\car-pub-vue\node_modules\sass-loader\dist\index.js:80:29)
查看項目的node_modules目錄，有sass-loader，卻沒有node-sass。
安裝sass吧。命令：
npm install node-sass -g
可是，在執行命令時提示了好多錯誤，如
Cannot download "https://github.com/sass/node-sass/releases/download/v4.13.0/win32-x64-72_binding.node"， 原因是sockettimedout。
MSBUILD : error MSB4132: 無法識別工具版本“2.0”。可用的工具版本為 "4.0"
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@2.1.2: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"})
python
網上資料有很多，不過每個人的情況不一樣，所以，並沒有解決我的問題。
最終解決辦法是使用cnpm命令取代npm，成功安裝sass包。
cnpm uninstall node-sass cnpm install node-sass